People in the bitcoin community periodically worries about bubbles. The only thing that we can do is figure out cool stuff that you can only do with bitcoin. Other than that, people are encouraged to sell and buy things for bitcoin.

A lot of cool stuff is in the pipeline though:

1. A decentralized DNS registration system utilizing bitcoin technology. http://www.bitcoin.org/smf/index.php?topic=6017.0 There's even a 3500 BTC bounty for it: http://www.bitcoin.org/smf/index.php?topic=2072.0

2. GBSE - Global Bitcoin Stock Exchange: Utilize public key cryptography and other tech to create a bitcoin stock market. http://www.bitcoin.org/smf/index.php?topic=5947.0

3. witcoin - a micropayment social media site. http://witcoin.com

The bitcoin community has thought more about the weakness and strength of the currency, failure modes and solutions to problems more than any critics about bitcoin in the world. It's just that very few bothers writing and publish these knowledge for distribution to the wider public.